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Mikako is well known for aggressiveness towards Tomoki also she always torments him. She comes up with very perverted things get him to do what she wants (eg.The snowball fight) she made this event to get the boys to do whatever she wanted.

Mikako is very obsessed with violence and says that Astraea was her student and tried to teach her how to eliminate Tomoki, she is also very sadistic.

On rare occasions, Mikako has shown a concern and emotional understanding of Ikaros when she orders Ikaros to drop Tomoki into the sea with the intention of Ikaros revealing her feelings to Tomoki.

Mikako is a tall, well endowed young woman. She has long purple hair with two ribbons tied to both of her side burns. She has squint-y dark-purple eyes and maintains a constant grin, which reflects her sadistic attitude. She is equal in height and weight to Eishirou Sugata.

Mikako is an upperclassman to Tomoki and Sohara and the president of the Student Council. She is Eishirou's childhood friend, whom she refers to as "Ei-kun," and the heiress of a Yakuza family. She is manipulative, a genius intellectual, cunning, highly intelligent and sadistic, usually towards Tomoki. In the manga, she is forced to take supplementary lessons due to "failing in morals". She is also equal to Sugata in terms of combat abilities. However, Nymph states that she has a grip power of 400kg, which serves to indicate she has a great degree of strength, especially for a normal human. She is the chief mastermind of many schemes in the manga, and Sugata normally enlists the help of Tomoki (and occasionally some others) by persuading him to totally shut down her plans. Many of her schemes are directed to Tomoki, serving to put him in undesirable situations and humiliating him, which suggests she sees him as a toy for her personal entertainment. She is also extremely lucky, since Sugata once mentioned that Mikako once struck gold simply by digging a hole, and oil as well.

In the second movie (Eternal my master), she is shown to have some power that manipulating the mind of Ikaros due to Ikaros lacks of emotions, that time Mikako needs to develop more Ikaros' true feelings towards her Master, Tomoki. Mikako as an Angeloid in the past that is shown when she is manipulating the mind of Ikaros, the memory of Ikaros slightly shown the Angeloid Mikako is controlling the functions of Ikaros when Ikaros was still the "destructive object" until Ikaros became dysfunctional and dropped to the earth.

Mikako is described as a devil who thinks people are toys from Tomoki in the manga.

Mikako has a golden retriever as a pet and often is seen walking him/her in the anime.

Mikako has a lot of weapons which are mostly guns, war planes, tanks, and bigger guns.

Mikako will be one of the main characters in the second movie.

Mikako is so rich that when she had the rich contest, Sugata was about to explain when he decided it was best to keep quiet.

Mikako is called "Black Money" during a contest to see who is the richest in the manga.

Mikako is always carrying something wherever she goes (Saw to help Sohara).

Mikako is most of the time seen drinking a cup of tea in many places: the school, at her home, and in Tomoki's house.

She has likeness to the character Kotonoha Katsura (School Days) in mental (Yandere Stated) and physical appearance, and they come from families in good economic standing. Both of them stay smiling without crying, hugging their dead lover.

She also makes a minor appearance in Daisuki desu!! Mahou Tenshi Cosmos, another work by Minasuki Suu

She is also possibly an angel. As mentioned in manga chapter epilogue (77.6 First Birthday), where Sugata asked for her real birthday in reality which suggested Sugata probably knew her true identity but she kept avoiding the questions and didn't answer it. In the 2nd movie, Eternal my master it also shows Mikako has met Ikaros in the past with wings that can be seen on Mikako in the Ikaros' memories.

To be specific, Mikako could have been one of the angels of synapse since all the people of Synapse are sleeping and are in their human avatar.

Note that angels might have powers. Ex. Minos summoning his Poseidon and Mikako with her hacking.